For the function \[f(x)={{x}^{2}}-6x+8,2\le x\le 4\], the value of x for which \[f'(x)\] vanishes, is [MP PET 1996]

For the function \[f(x)={{x}^{2}}-6x+8,2\le x\le 4\], the value of x f

1.	For the function \[f(x)={{x}^{2}}-6x+8,2\le x\le 4\], the value of x for which \[f'(x)\] vanishes, is [MP PET 1996]
A.	\[\frac{9}{4}\]
B.	\[\frac{5}{2}\]
C.	3
D.	\[\frac{7}{2}\]
Answer» D. \[\frac{7}{2}\]

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For the function \[f(x)={{x}^{2}}-6x+8,2\le x\le 4\], the value of x for which \[f'(x)\] vanishes, is [MP PET 1996]

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